Nothing. It was actually pretty funny:
You see, it starts of with Francine and Catherine mixing up their bags on their way to school (they have identical ones) so when they left Francine found that she had the wrong one. When they looked inside she found a magazine called 'Popular Girls' and realised that it much be a "teenage magazine". They took one of those tests where scores you get a certain score for whatever question you answer, and Fern and Sue Ellen found out that they were "too quite" and "too outspoken", so obviously then they act all ridiculous to iron out their "flaw" and in the end the usual "we liked you the way you were before", and yadda yadda yadda from their friends.
Brain: "Is that Popular Science?!" *looks at cover* "Oh, nevermind..."
It was very funny, especially the chaos they caused throughout the school 'cause they were working on a project.
Buster's Growing Grudge is about Buster telling Binky a joke he was going to use for his report, but Binky goes and tells it to the whole class. He finds out that Binky got a C while he got an F (or was it a D?) and he blamed it on the joke saying that it got Binky a higher grade. It was hilarious at the time, and probably still is.
Of course, I'm going to tell you that that was by far the best season of the show IMO. Quite fitting seeing as it all fell apart afterwards.